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Model 11180A
3-9.
Preset Trigger may be used to begin an output cycle.
Triggering is continuous either from an external source or
internally. When any of the three Preset Trigger lines are
grounded, the "X" number of previously stored reading is
dumped out plus the next "Y" readings as shown in Figure
3-5. The sum of
"X"
and
"Y"
equals the Storage Limit, and
"X" equals
''O",
"1
O",
or "20" previous readings. Input
Cycle Hold must be grounded in this mode of operation.
Input Cycle Hold causes readings to be continuously
inputted without any output unless given a Preset Trigger.
3-10.
Grounding Measurement Hold stops all sampling
both from external and internal trigger sources. It also
inhibits both input and output storage cycles. Ungrounding
Measurement Hold momentarily as shown in Figure 3-6
causes Data Storage to cycle through one complete input
and output cycle automatically. Triggers equal to the
Storage Limit are counted automatically.
3-11. Grounding COMPUTER CONTROL ENABLE allows
one line, MEASURE, to be used to gate readings into and
YES
NO
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Section III
out of storage as shown in Figure
3-7.
DUMP HOLD or
PRINTER HOLD-OFF are no longer needed to gate
readings out. The nature of STORAGE FLAG also changes
to acknowledge each MEASURE for both storage and
output cycles. This mode
of
operation was designed for
computer systems or systems with a limited number of
control lines. The timing for Data Storage running at a
50 kHz output rate is shown in Figure 3-8.
3-12.
The question is which method of storing readings
should be used for various applications? If the trigger
source counts the triggers (i.e. triggers from the 3485A
Scanning Unit are automatically
counted),
then the output
cycle begins more or less automatically. If the trigger source
is free
running,
one of the Preset Trigger lines may be used
or Measurement Hold may be used. The Preset Trigger has
the advantage since the DVM may be triggered prior to a
storage cycle to allow the proper range and function to be
set up manually. Preset Trigger requires exactly the same
type of input as any other trigger and is most likely to be
compatible with a given system. Figure 3-1 should make
this selection clear.
OUTPUT IS
AUTOMATIC
USE SCANNER
~-----1
CONTROL ENABLE TO
START OUTPUT
USE JUMP
TO START
OUTPUT
START STORAGE ANO
OUTPUT CYCLE BY
UNGROUNDING MEASUREMENT
HOLD
USE PRESET
TRIGGER
"O"
.---------f
(INPUT CYCLE
HOLD GROUNDED)
USE PRESET TRIGGER
~----I
"10"
OR "20" (INPUT
CYCLE HOLD GROUNDED)
Figure 3-1. Storage Operations.
3-3
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